I've a tow-bar mounted bike rack - that when loaded obscures my number plate.

I rang Transport WA today to try to order an auxiliary plate that I could mount on the rack to be told, very abruptly, they don't do them? Seesh and here's me trying to stay legal *heaven forbid*

WTF?! Is that right? Anyone got any other experiences of that are WA-specific. If I was in NSW I could go to myplates.com.au and order a bike-rack plate by name - seems perverse that I can't here.

27.5.15 PMBC President Update.